28845-75-2Relevant academic research and scientific papers
Visible-Light-Promoted Generation of α-Ketoradicals from Vinyl-bromides and Molecular Oxygen: Synthesis of Indenones and Dihydroindeno[1,2-c]chromenes
Pagire, Santosh K.,Kreitmeier, Peter,Reiser, Oliver
supporting information, p. 10928 - 10932 (2017/08/30)
Ortho-alkynylated α-bromocinnamates can be converted by a visible-light-mediated photocascade reaction with molecular oxygen into either indenones or dihydroindeno[1,2-c]chromenes. The one-step process features key photochemical steps, that is, the initial activation of vinyl bromides through energy transfer to give α-ketoradicals in a reaction with molecular oxygen, followed by α-oxidation of an arene moiety by 6-π electrocyclization, and subsequent hydroxylation by an electron-transfer process from the same photocatalyst leads to the dihydroindeno[1,2-c]chromenes.
Enantioselective organocatalytic synthesis of α- cyclopropylphosphonates through a domino michael addition/intramolecular alkylation reaction
Faisca Phillips, Ana Maria,Barros, Maria Teresa
, p. 152 - 163 (2014/01/06)
An organocatalytic domino reaction consisting of Michael addition/intramolecular alkylation between α,β-unsaturated aldehydes and bromophosphonoacetates was developed. Highly functionalised cyclopropylphosphonates containing three chiral centres, one of them quaternary, were obtained with good diastereoselectivities of up to 83:17 and very high enantioselectivities of up to 99 %. α-Cyclopropylphosphonates with three stereogenic centres were obtained in good yields and high enantio-and diastereocontrol through a "one-pot" domino process catalysed by a chiral pyrrolidine. The highly functionalised cyclopropanes should be versatile starting materials for biologically important compounds. Copyright
A new general approach to 4-substituted-3-halo-2-quinolones
Zhao, Shuai,He, Yan-hong,Wu, Di,Guan, Zhi
experimental part, p. 597 - 605 (2010/06/21)
A general procedure for the preparation of 4-substituted-3-halo-2-quinolones (halo = F, Cl, Br) utilizing 2-halo diethylphosphonoacetic acids (halo = F, Cl, Br) and o-aminophenylketones as the starting materials is described. The title compounds are obtained by an intramolecular Horner-Wadsworth-Emmons olefination of halogen-containing N-acyl-o-aminophenylketones. The transformation process is generally applicable under mild conditions.
